Originally Posted by
cooker
Public transit involves a lot more exercise than driving. You walk to and from the bus station, up and down the subway stairs and so on, plus you carry anything you buy, and perhaps a briefcase or computer, and if it's crowded you often end up standing.
Good point. It's also unreasonable to expect people to walk everywhere because distances are often too great, so the ideal mix involves walking or cycling to the bus stop or the train or underground station.